Bevy `3d_gizmos` doesn't have closed shapes

[pablo-lua]

Bevy version and features

• Bevy main
• Related: Add explicit gizmo mechanism for drawing closed shapes #22081

What you did

Ran 3d_gizmos example

What went wrong

Even though my line joints are on, the rect in this image doesn't close with itself:

Additional information

Looks like the rect implementation isn't using the solution in #22085. I don't know for sure why, if it is in purpose or if it shouldn't use the same impl. In either case, the issue presented should be fixed.
If a new implementation of the closed shapes should be made, it should probably take #22095 into account

[alice-i-cecile]

We should reuse the impl from the linked pr here too.

[uckelman]

Ah, yes---I didn't do anything for 3D case. It needs addressing.